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☑ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from NW Natural HOLDINGS ™ NORTHWEST NATURAL HOLDING COMPANY ( Exact name of registrant as specified in its charter ) to NW NaturalⓇ Oregon Commission file number 1-38681 82-4710680 ( I.R.S. Employer Identification No. ) ( State or other jurisdiction of incorporation or organization ) 250 S.W. Taylor Street Portland Oregon ( Address of principal executive offices ) Registrant's telephone number : Securities registered pursuant to Section 12 ( b ) of the Act : Registrant Northwest Natural Holding Company 97204 ( Zip Code ) ( 503 ) 226-4211 NORTHWEST NATURAL GAS COMPANY ( Exact name of registrant as specified in its charter ) Commission file number Oregon ( State or other jurisdiction of incorporation or organization ) 250 S.W. Taylor Street Portland Oregon ( Address of principal executive offices ) Registrant's telephone number : Title of each class Common Stock None Trading Symbol NWN None 93-0256722 1-15973 ( I.R.S. Employer Identification No. ) 97204 ( Zip Code ) ( 503 ) 226-4211 Name of each exchange on which registered New York Stock Exchange None Northwest Natural Gas Company Securities registered pursuant to Section 12 ( g ) of the Act : None . Yes ☐ No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . NORTHWEST NATURAL HOLDING COMPANY Yes ☑ No ☐ NORTHWEST NATURAL GAS COMPANY Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . NORTHWEST NATURAL HOLDING COMPANY Yes ☐ No ☑ NORTHWEST NATURAL GAS COMPANY Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . NORTHWEST NATURAL HOLDING COMPANY Yes ☑ No ☐ NORTHWEST NATURAL GAS COMPANY ☑ Yes ☐ No ☑ Yes ☑ ☑ ப No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . NORTHWEST NATURAL HOLDING COMPANY Yes ☑ No ◎ NORTHWEST NATURAL GAS COMPANY Yes No ☐ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . NORTHWEST NATURAL HOLDING COMPANY Large Accelerated Filer Accelerated Filer Non - accelerated Filer Smaller Reporting Company Emerging Growth Company □ □ □ □ □ NORTHWEST NATURAL GAS COMPANY Large Accelerated Filer Accelerated Filer Non - accelerated Filer Smaller Reporting Company Emerging Growth Company ☐ ☐ ☐ ☐ ☐ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . NORTHWEST NATURAL HOLDING COMPANY Yes ☑ No ☐ NORTHWEST NATURAL GAS COMPANY Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . NORTHWEST NATURAL HOLDING COMPANY Yes ☐ No ☑ NORTHWEST NATURAL GAS COMPANY Yes ☐ No ☑ Yes ☐ No As of the end of the second quarter of 2020 , the aggregate market value of the shares of Common Stock of Northwest Natural Holding Company ( based upon the closing price of these shares on the New York Stock Exchange on June 30 , 2020 ) held by non - affiliates was $ 1,682,261,011 . ☑ At February 16 , 2021 , 30,606,665 shares of Northwest Natural Holding Company's Common Stock ( the only class of Common Stock ) were outstanding . All shares of Northwest Natural Gas Company's Common Stock ( the only class of Common Stock ) outstanding were held by Northwest Natural Holding Company . This combined Form 10 - K is separately filed by Northwest Natural Holding Company and Northwest Natural Gas Company . Information contained in this document relating to Northwest Natural Gas Company is filed by Northwest Natural Holding Company and separately by Northwest Natural Gas Company . Northwest Natural Gas Company makes no representation as to information relating to Northwest Natural Holding Company or its subsidiaries , except as it may relate to Northwest Natural Gas Company and its subsidiaries .